Two-cycle engine.



- A. WINTON & H. B. ANDERSON.

TWO CYCLE ENGINE.

APPLICATION FILED APR. 2, 1908 1,046,359,, Patented Dec, 3, 1912.

q Vitubsaw a I M A. WINTON & H. B. ANDERSON.

TWO CYCLE ENGINE.

APPLICATION I'ILED APR. 2, 1908.

1,046,359., Patented Dec.3,19 12;

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ALEXANDER WIN'TON AND HAROLD B. ANDERSON, F CLEVELAND, OHIO, ASSIGNOBSTO THE WINTON MOTOR CARRIAGE COMPANY, OF CLEVELAND, OHIO.

TWO-CYCLE ENGINE.

Specification Letters Patent.

his invention relates to improvements in two cycle engines, the objectof which is to insure an explosion at each stroke of the piston with anexceedingly small charge of fresh explosive mixture, thereby materiallyincreasing the flexibility of the engine with a minimum charge, andeffecting economy in the operation thereof by enabling'very smallcharges to be used, without controlllng I by retarded spark.

It is known to those skilled in this art that in two-cycle engines asnew constructed,

it is necessary to admit the fresh charge of sufficient volume todisplace enough-of the burnt gases to cause the fresh charge to reachthe spark plug, in order to obtain an explosion, and that because ofthis necessity the engine is almost wholly controlled by the spark atvery low speeds, and that much larger charges for low, speeds arenecessary than are necessary in a four-cycle type of engine, in whichlatter type the burnt gases are expelled from ,the cylinder by theexhaust movement of the piston, so that the fresh charge enters thecylinder when it is practically clear of the burnt gases. Because of.this difference, between a four-cycle and the two-cycle ofthe typesknown to us, the former is more flexible and more economical in point offuel consumption at low speeds than the latter.

The present invention enables a two-cycle engine to operate with aslittle throttle for low speeds, and ,as economically as a fourcycle, andalso enables the motor to be controlled at low speeds by the throttlealone, as in a four-cycle engine, by providing the piston withasmallfresh charge pocket which is not coextensive with the cylinder-inletport, in which the small fresh charge is delivered, and carried by thesaid pocket directly to or around thespark plug at the time of ignition.

i We do not claim hereinbroadly the idea of providing the'piston with afresh charge Application filed April 2, 1908. Serial No. 424,817.

pocket, adapted to deliver a fresh charge to the spark plug, for this ismade the subject matter of an earlier filed co-pending application,filed January 20th 1908, Serial Number 411,753.

In theaccompanying drawings, Figure 1, is a vertical sectional view ofan engine having the preferred form of this invention. Fig. 2, is adetached perspective view of an engine piston having the preferred formof the present invention. Fig. 3, is a top plan viewof Fig. 2. Fig. 4,is a vertical, sectional view of the cylinder and piston of an enginehaving a modification of the present improvement. Fig. 5, is a detached,perspective View of the piston of Fig. L- Fig. 6, is a detached,perspective view of the present improvement, showing another form.

of the invention. Fig. 7, is a side elevation -of the end of the pistonshown in Fig. 6.

In carrying out the present invention, as illustrated in Figs. 1 to 3inclusive, the usual form of cylinder 1 may be used. This cylinder isprovided at one side with the usual exhaust-port 2 and at the oppositeside with the intake-port 3. Located below the exhaust-port 2 is thecarbureter-port t'which communicates with the carbureter 5 and with thecrank-case 6 when the piston is in its outward or upward position. Asiswell understood by those skilled in this art, in three-port two-cycleengines when the piston 7' moves upward it creates a vacuum, or atendency to a vacuum, within the crankcase 6, and that when thecarbureter-port' 4 is uncovered by the piston, the vacuum in thecrank-case draws the charge through the carbureter into the crank-case,and that when the piston moves downward the charge in the crank-case iscompressed, and this compression forces it into the cylinder 1 as soonas the piston moves to its downward position to permit communication tothe-cylinder.

Turning now to the present improvement, and referring to the form shownin Figs. 1 to 3, the piston 7 is provided with a pocket which in thisform consists of a horizontal portion 8, and a vertical portion 9. The

cylinder in take-port 3 is laterally c'o-extensive with the usualdeflector 10 of the piston, so that it will act to deflect theincomsmall charges for low speeds, the fresh- A charge pocket justreferred to receives the small charge before the intake .port 3 is'spark lead with the spark-plug in the fresh charge pocket, depends uponthe depth of the fresh charge pocket and the distance that thespark-plug enters the pocket. The relative depth of the pocket and theentrance of the spark-plug thereinto, as shown in Fig. 1, is found inpractice to be approximately all that is necessary to obtain thepractical advantages of the present improvement.

In order to insure. the entrance of the small charge at very low speedsinto the fresh-charge pocket, the relative positions of the cylinderinlet-port 3 and the freshcharge pocketare such that the latter isbrought in communication with the cylinder intake-port 3 in advance ofthe opening of the whole port, which causes the small charge to beforced directly into the freshcharge pocket, and as this is very smallthe minimum charge will completely scavenge the pocket of the burntcharge, and the fresh new charge, no matter how small, is delivered bythe pocket. directly to the spark-plug at the time of ignition, which inactual practice is found to absolutely insure positive explosions of thevery smallest charge at every stroke of the piston. This enables theinvention to be worked economically at low speeds, and to be controlledby the throttle at low speeds like a four-cycle engme, and to make ,theen ine as flexible at lowspeeds as the four-eye e. As shown in Figs. 1to 3, the fresh-charge pocket is brought into communication with thecylmder intake-port 3 in advance of the complete opening of all the portby making the mlet end 8 of the pocket a little lower or which lattercontrols the opening-of all of the inlet port 3.

Referring now to Figs. 6 and 7, which show a slight modification, inwhich the fresh-charge pocket has its horizontal port1on 8 in the sameplane as the head 12 of the piston (Fig. 7 the piston inlet-port 3 isprovided with a cut-out or off-set portion 3' which extends in thedirection toward the upper or outer end of the cylinder.

farther in than the head 12 of the piston,

This off-set "portion 3' is of the same width, oi is co-extensive withthe intake-portion 8 of the fresh-charge pocket. From this 1t will beobserved that the fresh-charge. pocket is brought in communication w1ththe cylinder intake-port in advance of the opening of the whole port,which causes the small charge to enter the fresh-charge pocket inadvance of the opening of the whole of the intake-port, and has the sameeffect and result as the lowering of the fresh-charge pocket as shown 1nFigs. 1 and 3.

- In Figs. 4 and 5 is shown a modification in the construction of thefresh-charge pocket. In this event the fresh-charge pocket isconstructed for use in-connection with a horizontally-arrangedspark-plug 13, and the pocket 14 in this lnst-ance is a vertical well 14which receives the fresh charge 35 and delivers it to the spark-plug, asindicated in Fig. 4. While the pocket 14 is here shown as extendingbelow the head 12 of the piston, it is to be understood that thecylinder intake-port may be provided with an 0 off-set portion, as shownin 6, and in this instance the lower wall of the pocket 14 can be on aline with the head 12 of the piston.

The construction herein shown and described is an improvement upon thegeneric invention of our co-pending application, Serial Number 411,7 53,and we do not therefore claim herein the generic invention, for this isthe subject matter of our said 00- pending application.

Having thus described this invention what isclaimed and desired to besecured by Letters Patent, is

1. In a two cycle engine, the combination with a cylinder having anintakeort, a piston cut-away to uncover the inta e-port when the pistonis in the charging position, and a fresh charge pocket carried by thepiston and positioned to communicate with the intake-port in advance ofthe uncovering of the intake-port by the movement of the piston, and asparkin device carried by the cylinder in linewit and adapted to enterthe fresh charge pocket.

2. In a two cycle engine, the combination of a cylinder having anintake-port, a piston controlling the intake-port and having arelatively'small fresh charge pocket, the intake-port and fresh chargepocket relatively 120 positioned to cause the fresh charge ocket toregister with the intake-port in a vance of the opening of all of theintake-port by the movement of the iston, and a sparking device carriedbyt e cylinder in a line with 125 and adapted to enter the fresh chargepocket when the piston is in the firing position.

3. In a two cycle engine, the combination with a cylinder having anint-akesport, of a piston controlling the intake-port and hav- 139relatively positioned to cause the fresh chargepocket to register withthe intakeport in advance of "the opening of all of the intake-port forthe purpose described, and means for igniting the fresh charge withinthe said pocket when the piston is in the firing position.

In testimony whereof we affix our signatures in presence of twowitnesses. ALEXANDER WINTON. HAROLD B. ANDERSON.

ing a fresh charge pocket with an inletopening at a point-between theends of the piston, whereby it is adapted to register with the intake inadvance of the opening of all of the said port, and means for ignitingthe charge within the fresh charge pocket when the piston is in thefiring position. 4

4:. In a two cycle engine, the combination with a cylinder having anintake-port of sufiicient size for the maximum fresh charge,

of a piston controlling the intake-port and vWitnesses:havingarelatively small fresh charge pocket, 0. F. BAUGHMAN, theintake-port and fresh charge pocket G. M. LAVELLE.

Copies of this patent ma he obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

